Add a menu item to content_shell to open devtools to make it more discoverable.

content/shell/shell.cc

Index: content/shell/shell.cc
===================================================================
--- content/shell/shell.cc	(revision 150609)
+++ content/shell/shell.cc	(working copy)
@@ -8,8 +8,10 @@
 #include "base/command_line.h"
 #include "base/message_loop.h"
 #include "base/path_service.h"
+#include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
+#include "content/public/browser/devtools_http_handler.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/notification_details.h"
@@ -17,6 +19,9 @@
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
+#include "content/shell/shell_browser_main_parts.h"
+#include "content/shell/shell_content_browser_client.h"
+#include "content/shell/shell_devtools_delegate.h"
 #include "content/shell/shell_javascript_dialog_creator.h"
 #include "content/shell/shell_messages.h"
 #include "content/shell/shell_switches.h"
@@ -151,6 +156,19 @@
   PlatformEnableUIControl(STOP_BUTTON, web_contents_->IsLoading());
 }
 
+void Shell::ShowDevTools() {
+  ShellContentBrowserClient* browser_client =
+      static_cast<ShellContentBrowserClient*>(
+          GetContentClient()->browser());
+  ShellDevToolsDelegate* delegate =
+      browser_client->shell_browser_main_parts()->devtools_delegate();
+  GURL url = delegate->devtools_http_handler()->GetFrontendURL(
+      web_contents()->GetRenderViewHost());
+  CreateNewWindow(
+      web_contents()->GetBrowserContext(),
+      url, NULL, MSG_ROUTING_NONE, NULL);
+}
+
 gfx::NativeView Shell::GetContentView() {
   if (!web_contents_.get())
     return NULL;